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Ultrafine nanoporous Cu was successfully fabricated through the dealloying of amorphous Ti60Cu40¹xAux (x = 0, 1, 2at%) ribbon alloys in 0.65M HF solution under free immersion conditions. A bicontinuous nanoporous structure of Cu formed on Ti60Cu40 ,T i 60Cu39Au1 and Ti60Cu38Au2 ribbons with pore sizes of 134, 8.9 and 7.4nm, respectively. The pore size of the nanoporous Cu dealloyed from Au-added alloys was more than one order smaller than that of the Ti­Cu alloy, which resulted from the 5-order decrease in the surface diffusivity through alloying of Au into Ti60Cu40 ribbons. The Au content increased rapidly during the dealloying process and eventually formed binary Cu­Au solid solution and Au nanoparticles. Modifying the surface diffusivity by adding Au made it possible for the formation of the ultrafine nanoporous Cu structure. [doi:10.2320/matertrans.MAW201204]

Fabrication of Ultrafine Nanoporous Copper by the Minor Addition of Gold